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# Please someone help with this math probability question?

The probability that a certain brand of calculator is defective is known to be 0.2. Determine the probability that if 5 such calculators are examined none are found to be defective.

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- whitesox09Lv 71 decade agoFavorite Answer
P(not defective) = 1 - 0.2 = 0.8

P(5 aren't defective) = 0.8 * 0.8 * 0.8 * 0.8 * 0.8

= (0.8)^5

= 0.32768

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